Hi
I've got code below (copy/pasted) that works for grabbing data from a post/get request.
Can someone tell me what function I can use to check to see if a value was submitted or not? I have played with exists and defined, but couldn't get either to work right.
A user can post and id and another number. If the number isn't provided, I have a default number that I replace it with later. But I can't figure out how to tell perl that if the value isn't submitted, tell me.

Any ideas? And Thanks in advance!

if ($ENV{'REQUEST_METHOD'} eq 'GET') {
        @pairs = split(/&/, $ENV{'QUERY_STRING'});
} elsif ($ENV{'REQUEST_METHOD'} eq 'POST') {
        read (STDIN, $buffer, $ENV{'CONTENT_LENGTH'});
        @pairs = split(/&/, $buffer);
} else {
        print "Content-type: text/html\n\n";
        print "<P>Use Post or Get";
}

foreach $pair (@pairs) {
        ($key, $value) = split (/=/, $pair);
        $key =~ tr/+/ /;
        $key =~ s/%([a-fA-F0-9] [a-fA-F0-9])/pack("C", hex($1))/eg;
        $value =~ tr/+/ /;
        $value =~ s/%([a-fA-F0-9] [a-fA-F0-9])/pack("C", hex($1))/eg;
        
        $value =~s/<!--(.|\n)*-->//g;
        
        if ($formdata{$key}) {
                $formdata{$key} .= ", $value";
        } else {
                $formdata{$key} = $value;
        }
}

$id = $formdata{'id'};
$num = $formdata{'num'};      #If there great, if not how do i know?
$num = sprintf("%3.3f",$num);  #if num is not present, this makes num 
+0.
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